Crack-cutting tool.



PATENTED JULY 17, 1906.

.L. NEWMAN. CRACK CUTTING TOOL.

APPLICATION FILED NOV. 8. 1904.

INVENTOH fiaa em/11am er ATTORNEYS.

WITNESSES THE NORRIS PETERS co.. wAsI-Ilucmlv, n c.

edges of the crack trimmed or cut away, so as to widen the LOUIS NEWMAN.OF NEW YORK, N. Y.

CRACK-CUTTING TOOL.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed November 8, 1904. Serial No. 231,935.

To all whom it may concern:

Be it known that I, LOUIS NEWMAN, a citizen of the United States,residing in New York, borough of Manhattan, and State of New York, haveinvented certain new and useful Improvements in Crack-Cutting Tools, ofwhich the following is a specification.

Before appplying the paint or paper to the plaster of interior walls itis necessary to open or widen the cracks in the plaster, so as to permitthe insertion of a sufficient quantity of plaster-of paris for thepurpose of fillin said cracks, so that the paper or paint wil present asmooth and even outersurface. Heretofore this widening was usually doneby means of a knife or similar tool, so that it was necessary to scrapeone edge of the crack after another, thus consuming considerable timeand causing great delay in the work of, painting or paper-hanging.

This invention is intended to obviate the disadvantages referred to andto'furnish to painters and paper-hangers a tool by means of which withone stroke of the same both are simultaneously crack sufliciently toreceive and retain a filling ofplaster-of paris or other suitablematerial, so as to render the surface of the wall, and thereby the paperor paint applied to the same, smooth and even; and for this purpose theinvention consists in the novel features and combinations of parts to behereinafter described and claimed.

In the accompanying drawings, Figure 1 is a perspective view of myimproved crackcutting tool. Fig. 2 is a side elevation of-the same. Fig.3 is an end view; andFig. 4, a horizontal section on line 4 4, Fig. 3,through the cutting-blades.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, A represents the handle, and B the knife, ofthe crack-cutting tool. The knife is fastened to the handle by means ofa shank d, that is arranged at an obtuse angle of inclination to thecutting-knife B, said shank being inserted into the handle and firmlysecured therein. The knife is formed. of two curved blades 1) b, whichare directly interconnected at substantially the same angle at theirfront and rear ends, so as to form an elongated fusiform opening betweenthem, the front end 9 having a slight forward inclination and beingsharpened, so as to facilitate the insertion of the knife in the crack,while the rear end is preferably formed integral with the shank d. Theinner edges 6 e of the curved blades are sharpened, while the outeredges f f remain dull, so that by moving the tool quickly along thecrack both edges of the latter are simultaneously cut to a widthcorresponding to the distance between the curved blades and producethereby a uniform widening or enlar ing of the crack. The blades beingcurved, as shown, adapt themselves to variations of the width of thecrack. After the crack has been scraped it is ready to be filled withplaster-of-paris or other suitable material preparatory to painting orpapering the same.

The cutting-blades may be made of toolsteel and sharpened at theirinclined front edges, as well as at the inner edges, so as to permit theinsertion of the tool into the crack and the quick and smooth cutting ofboth edges of the same preparatory to filling. By the use of theimproved tool painters are enabled to attend quickly to the clearing outof cracks of plaster-covered walls, combining two operations necessaryby the use of tools hitherto in use into one, saving therebyconsiderable time and labor.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A crack-cutting tool comprising a shank, and twoblades extending fromsaid shank and interconnected at both ends, saidblades being spaced apart at their intermediate portions and having afusiform opening between the same.

2. A crack-cutting tool comprising a shank, and two curvedcutting-blades extending therefrom and directly interconnected at bothends at substantially the same angle, said blades forming between theman elongated fusiform opening.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

LOUIS NEWMAN.

Witnesses:

PAUL GoEPEL, HENRY J. SUHRBIER.

